The dahlia is a colorful annual favored by many gardeners because it is fuss-free and low maintenance. Flowers come in rainbow colors, but the main attraction is the variety of flower styles. Single-flowering and anemone blooms appear delicate in sharp contrast to ball, pom-pom and cactus dahlias. These flowers are favorite subjects for photographs, paintings and other floral art elements that make great canvas prints, posters or wall peels. Get started on your own flower wall art collection to help create a refreshing and relaxing indoor oasis.